erpnext/maintenance/search_criteria/warranty_amc_summary/warranty_amc_summary.sql

SELECT CONCAT(REPEAT('     ', COUNT(parent.name) - 1), node.name) AS name FROM `tab%(based_on)s` AS node,`tab%(based_on)s` AS parent WHERE node.lft BETWEEN parent.lft AND parent.rgt AND node.docstatus !=2 GROUP BY node.name ORDER BY node.lft